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Rajkumar R.,Dhanalakshmi College of Engineering
2013 IEEE International Conference on Emerging Trends in Computing, Communication and Nanotechnology, ICE-CCN 2013 | Year: 2013

The modern mobile communication systems requires high gain, large bandwidth and minimal size antenna's that are capable of providing better performance over a wide range of frequency spectrum. This requirement leads to the design of Microstrip patch antenna. This paper proposes the design of 4-Element microstrip patch antenna array which uses the corporate feed technique for excitation. Low dielectric constant substrates are generally preferred for maximum radiation. Thus it prefers Taconic as a dielectric substrate. Desired patch antenna design is initially simulated by using high frequency simulation software SONNET and FEKO and patch antenna is designed as per requirements. Antenna dimensions such as Length (L), Width (W) and substrate Dielectric Constant (εr) and parameters like Return Loss, Gain and Impedance are calculated using high frequency simulation software. The antenna has been designed for the range 9-11 GHz. Hence this antenna is highly suitable for X-band applications. © 2013 IEEE.

Hemalatha M.,Dhanalakshmi College of Engineering | Suriyanarayanan N.,Government College of Technology, Coimbatore
Optik | Year: 2014

Nickel nanoparticles have been synthesized by chemical reduction method. By the analysis of X-ray diffraction, the resultant particles are characterized and found to be pure crystalline nickel with a face-centered cubic (FCC) structure. The morphology and size of the nanoparticles are studied by scanning electron microscopy (SEM) and micrographs reveal that the nanoparticles are mostly spherical. The compositional analysis has been carried out by using EDAX. The quantum size confinement of the crystallites is evident from the blue-shift of the absorption edge in the UV-vis absorption spectrum. © 2013 Elsevier GmbH.

Saravanan R.,Dhanalakshmi College of Engineering | Saravanan R.,University of Madras | Gupta V.K.,Indian Institute of Technology Roorkee | Narayanan V.,University of Madras | Stephen A.,University of Madras
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

The novel ZnO/γ-Mn2O3 (various weight percentages) nanocomposite catalysts were prepared by thermal decomposition method and their size, shape, and surface area were characterized by various techniques. Further, the prepared samples were used to degrade methylene blue (MB) and methyl orange (MO) in aqueous medium under visible light irradiation. Finally, the best catalyst was employed to degrade phenol and a textile effluent. The recycling ability and their efficiency of catalyst are discussed in detail. © 2013 Taiwan Institute of Chemical Engineers.

Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Jeyasubramanian K.,Mepco Schlenk Engineering College, Sivakasi | Sharmila R.,Dhanalakshmi College of Engineering
Progress in Organic Coatings | Year: 2012

Nano containers with a shell possessing controlled release properties can be used to fabricate a new family of active coatings that can respond quickly to change the environment/integrity of the coatings. The release of corrosion inhibitors encapsulated within nano containers can prevent further corrosion. The structural evolutions and morphological characteristics of nano particles are investigated using XRD, SEM, FT-IR and AFM. The author reports an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde capsules filled with a healing agent, linseed oil and corrosion inhibitors. Capsules with diameters as small as 30-40 μm are achieved using stirring techniques. Cracks in paint film were successfully healed when linseed oil and nanoparticles was released from microcapsules ruptured under stimulated mechanical action. Further linseed oil healed area was found to prevent corrosion of the substrate. © 2012 Elsevier B.V. All rights reserved.

Chithambaram V.,Dhanalakshmi College of Engineering | Krishnan S.,B.S. Abdur Rahman University
Optics and Laser Technology | Year: 2014

Urea Zinc Acetate (UZA), a novel semi organic nonlinear optical crystal having dimensions 30×28×10 mm3 has been synthesized using slow evaporation technique. The lattice parameters for the grown crystals were determined using single crystal XRD. The presence of functional groups for the grown crystals was confirmed using Fourier Transform Infrared (FT-IR) spectroscopy. The optical absorption studies show that the material has wide optical transparency in the entire visible region. The thermal stability of the crystal was determined from thermo gravimetric and differential thermal analysis curve. The second harmonic generation was confirmed by Kurtz powder method and it is found to be 3 times than that of KDP crystal. © 2013 Elsevier Ltd.

Shanmugan S.,Dhanalakshmi College of Engineering
2013 International Conference on Energy Efficient Technologies for Sustainability, ICEETS 2013 | Year: 2013

A single slope single basin type solar still has been designed and fabricated. The system has been tested with dripping of saline water on cotton fin wick in the basin liner. Energy balance equations for the moist air inside the still, glass cover and fin cotton wick have been written and solved to get the analytical expressions for the instantaneous efficiency of the proposed system. The numerical calculations have been done and validated with the experimental observations for a few typical days during October 2011 and September 2012. © 2013 IEEE.

Ganapathy P.,Alagappa Chettiar College of Engineering And Technology | Manivasagam G.,Vellore Institute of Technology | Rajamanickam A.,Dhanalakshmi College of Engineering | Natarajan A.,Pondicherry Engineering College
International Journal of Nanomedicine | Year: 2015

This paper presents the wear characteristics of the composite ceramic coating made with Al2 O3 -40wt%8YSZ on the biomedical grade Ti-6Al-4V alloy (grade 5) used for total joint prosthetic components, with the aim of improving their tribological behavior. The coatings were deposited using a plasma spraying technique, and optimization of plasma parameters was performed using response surface methodology to obtain dense coating. The tribological behaviors of the coated and uncoated substrates were evaluated using a ball-on-plate sliding wear tester at 37°C in simulated body-fluid conditions. The microstructure of both the titanium alloy and coated specimen were examined using an optical microscope and scanning electron microscope. The hardness of the plasma-sprayed alumina–zirconia composite coatings was 2.5 times higher than that of the Ti-6Al-4V alloy, while the wear rate of Ti-6Al-4V alloy was 253 times higher than that of the composite-coated Ti-6Al-4V alloy. The superior wear resistance of the alumina–zirconia coated alloy is attributed to its enhanced hardness and intersplat bonding strength. Wear-track examination showed that the predominant wear mechanism of Ti-6Al-4V alloy was abrasive and adhesive wear, whereas, in the case of alumina–zirconia composite coated alloy, the wear was dominated by microchipping and microcracking. © 2015 Ganapathy et al.

Deepa Shri S.,Dhanalakshmi College of Engineering | Thenmozhi R.,Vellore Institute of Technology
Life Science Journal | Year: 2013

In this study new mathematical models were proposed and developed by using a regression equation for the prediction of impact energy absorption of hybrid ferrocement slabs. Slabs were made up of self-compacting concrete (SCC) in order to minimize the external vibration work. Slabs of size 300 X 300 mm with varying parameters such as depth of slab (25 & 30 mm), number of layers of weld mesh (2 and 3 layers bundled), and wrapping with Glass Fiber Reinforced Polymer sheets (GFRP) (1 and 2 layers) along with a specified proportion (0 and 0.30%) of polypropylene fibers were cast. Impact load was applied by means of a hammer of weight 3.5 kg (34.335 N) and the initial and ultimate energy absorptions were evaluated. The variables used in the prediction models were the varying parameters such as number of layers of GFRP sheet, area of weld mesh and height of drop. According to the analysis, the models provide good estimation of impact energy absorption and yielded good correlations with the data used in this study.

Geerthy T.,Dhanalakshmi College of Engineering
2015 International Conference on Communication and Signal Processing, ICCSP 2015 | Year: 2015

Clinical breath analysis has been recognized for centuries, to detect the diseased state in humans. The exhaled breath consists of volatile organic compounds (VOC) which reflect the health status of an individual. Among the various gas molecules present in breath, ammonia specifically indicates the presence of pathological conditions like renal failure, gastric ulcer, liver failure etc. and hence can be used in diagnosis. Such monitoring can be done using existing techniques like Gas chromatography which involve a difficult sampling process and incur high cost. In this work, a low-cost and a less complex prototype model was developed to detect the presence of ammonia in human breath. This non-invasive technique involves a semiconductor sensor which is sensitivity to ammonia, has been calibrated and used to detect the presence of ammonia from the collected breath samples. The output generated is then interfaced to PC and finally the samples are analyzed for diagnostic applications. © 2015 IEEE.

Meenakshi Sundaram K.,Dhanalakshmi College of Engineering | Ravichandran C.S.,Sri Ramakrishna Engineering College
International Review on Computers and Software | Year: 2013

Chronic Obstructive Pulmonary Disease (COPD) is the fourth leading cause of death worldwide and the only chronic disease with increasing mortality rates. Progression of the disease is irreversible but can be stabilized or prevented by quitting. If COPD is detected earlier, the formation of lung cancer is prevented. In CT scan may provide additional information and also it provides more detailed images of parts of the body that cannot easily be seen on a standard chest radiograph. But the automatic screening process has lot of advantages such as decrease of labor, enhancing the sensitivity of the test and better precision in diagnosis by increasing the images that can be analyzed by the computer. Many researchers have proposed different techniques to improve the performance of automatic screening process. This paper involves in improving the accuracy over the existing technique using the adaptive region growing property and Extreme Learning Machine (ELM) classifier. Initially, pre-processing is carried out for the input image by Laplacian Gaussian filtering technique to make the image suitable for further processing. The contours of the image will be obtained using region growing technique. The ELM classifier is then used to confirm the suspected TB cavities. The classification will be carried out by the features which have been taken from the segmented image. The proposed technique is implemented in MATLAB and the performance is compared with the existing technique. From the experimental result it can be said that the proposed method achieved more accuracy as compared with existing techniques. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.

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